Research on Reliability Verification of Old Gas Regulator

In order to solve the problems of low operation reliability and high safety risk of old gas regulators,7471 in-service old gas regulators in Suining Branch of Sichuan Chuangang Gas Co., Ltd.were taken as the research object, and 287 were stratified sampled according to working years, using areas, pressure regulating ranges and brands. The reliability verification experiments of rubber diaphragms and springs were carried out.According to the national standard, the gas resistance, tensile properties, compression permanent deformation and spring accuracy grade (GB27790-2020) and test of rubber diaphragm were completed. The results showed that the gas resistance of 27,28 and 29 groups of diaphragms was the best (the mass / volume change rate was close to 0, and the coefficient of variation was less than 0.5 ). The qualified rate of grade II accuracy of 41 spring samples was only 19.5 %, and the unqualified was mainly due to the verticality exceeding the limit (maximum 12.2 mm). The tensile strength of RTZ-43 / 80 N membrane is 10.47 MPa, and the compression permanent deformation rate is less than 5 %. The research provides data support for the replacement cycle formulation and brand selection of old regulator components.